Thread: Anyone used "Peanut Ports" on your BBC?

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Originally Posted by 65cayne

Thanks for your input guys. I understand the theory behind the different size runners. I still havent heard someone say "Yeah, I ran a BBC with peanut heads and it performed like....."

Erik, long story on the heads. Basically, if GMPP can use them on a similar engine, then I dont see anything wrong with it. The short of it now is that I will either try and fix the RP's or go with the peanuts. Buyng a new set is out of the question unfortunately.

GRUMPY427...you reading this?? Was that you that did a mild 454 with the small port heads??


Any thoughts on that combo I found? HP seems a bit high but he claims he has a dyno sheet?

What is the similar engine that GM used those heads on?

Originally Posted by erik erikson

What is the similar engine that GM used those heads on?

454 HO TECH SPECS:
Part Number: 12568774
Engine type: Chevy big-block V-8
Displacement (cu in): 454
Bore x stroke (in): 4.25 x 4.00
Block (P/N 12561353): Cast iron with 4-bolt main caps
Crankshaft (P/N 14096983): Forged steel
Connecting rods (P/N 10198922): Forged steel
Pistons (P/N 10215228): Forged aluminum
Camshaft type (P/N 24502611): Hydraulic roller
Camshaft lift (in): .510 intake / .540 exhaust
Camshaft duration (@.050 in): 211'c1 intake / 230'c1 exhaust
Cylinder heads (P/N 12562920): Iron rectangular port; 118 cc chambers
Valve size (in): 2.19 intake / 1.88 exhaust
Compression ratio: 8.75:1
Rocker arms (P/N 12523976): Stamped steel
Rocker arm ratio: 1.7:1
Water pump (P/N 12484890): Cast iron, long-style
Flexplate (P/N 10185034): 14"
Recommended fuel: 92 octane
Ignition timing: 4'c1 BTDC
Maximum rpm: 5500

Maybe Im missing something here, but those heads on the GM engine are not similar to the peanut ports that you're talking about. Is that what you're trying to compare them to?

Originally Posted by 1JohnnyO

Maybe Im missing something here, but those heads on the GM engine are not similar to the peanut ports that you're talking about. Is that what you're trying to compare them to?

Nope, just gettin off topic.

I'm looking for people who've built and used street 454ci motors using the peanuts ports.

I have a basically stock rebuilt 454 with the 236 heads on it. It is in a 3300lb car and I only have a gtech time with it which was 13.46 with a 250lb buddy with me. It does feel like it is out of air at 4500 tops I would say.

Blackroc,
A few questions...

What's a GTECH ?
How does it pull UP TO 4500?
What kind of cam and rear gears are/were you running?

Thanks for chiming in !!

Originally Posted by 65cayne

Blackroc,
A few questions...

What's a GTECH ?
How does it pull UP TO 4500?
What kind of cam and rear gears are/were you running?

Thanks for chiming in !!

A gtech is a performance meter you mount in the car. The ET on them is usually pretty close to a track but the mph is usually 3-5 mph higher than a track would be.

http://www.gtechpro.com/

I bought the engine from a guy that had it rebuilt. He said it was a totally stock 454 rebuild.

I have 3.73 gears and have a 28" tire. I have a 3500 stall converter in a TH350 tranny. Seems like it is all done maybe 2/3 of the way through the quarter and pulls slowly after that.

Originally Posted by 65cayne

454 HO TECH SPECS:
Part Number: 12568774
Engine type: Chevy big-block V-8
Displacement (cu in): 454
Bore x stroke (in): 4.25 x 4.00
Block (P/N 12561353): Cast iron with 4-bolt main caps
Crankshaft (P/N 14096983): Forged steel
Connecting rods (P/N 10198922): Forged steel
Pistons (P/N 10215228): Forged aluminum
Camshaft type (P/N 24502611): Hydraulic roller
Camshaft lift (in): .510 intake / .540 exhaust
Camshaft duration (@.050 in): 211'c1 intake / 230'c1 exhaust
Cylinder heads (P/N 12562920): Iron rectangular port; 118 cc chambers
Valve size (in): 2.19 intake / 1.88 exhaust
Compression ratio: 8.75:1
Rocker arms (P/N 12523976): Stamped steel
Rocker arm ratio: 1.7:1
Water pump (P/N 12484890): Cast iron, long-style
Flexplate (P/N 10185034): 14"
Recommended fuel: 92 octane
Ignition timing: 4'c1 BTDC
Maximum rpm: 5500

GM,is rather limited to the heads they have.
I would think that this combination would work much better with a set of oval 265 cc AFR's or a set of oval 270 cc Brodix heads.
I.M.O.,325 cc heads are way to large for this application.